Cmake check if list is empty

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WebAnd then this still tells me "test" is not the empty string. Which can be considered expected behaviour if an empty variable is not the empty string, but both are "NOT test". … WebJun 28, 2024 · Looks like ENABLE_LIBCXX interpreted as string, not as a variable name (even being unquoted)… ???

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WebDec 24, 2024 · 3. Inspecting the Default Build Types. This section will focus on inspecting build types and their corresponding compiler flags. The CMake BUILD_TYPE variable … Webconsidered expected behaviour if an empty variable is not the empty string, but both are "NOT test". Something like QString::null () vs. QString::empty (). You just have to know about it's suptle differences. Eike Continue reading on narkive : Search results for ' [CMake] Checking for empty string' (Questions and Answers) 6 replies harley lever obituary

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WebNov 25, 2011 · ELSE () MESSAGE ("IF () says MYLIST is empty.") ENDIF () Because of non-empty strings - constituting non-empty lists - which evaluate to FALSE in the IF () … WebJan 11, 2024 · Initially, the subdirectory test/CMakeLists.txt script is empty. We will start filling it up by inserting a live template for Boost with libs. Press Ctrl+J or click Code Insert Live Template, and choose boost_with_libs: … channel 7 abc new york

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WebAn empty path evaluates to false. On Windows hosts, any path that begins with a drive letter and colon (e.g. C: ), a forward slash or a backslash will evaluate to true. This … WebOct 25, 2011 · If there is a variable named test, then we do variable-value comparison: if (test STREQUAL "") is equivalent to: if ("$ {test}" STREQUAL "") (It is this way for backwards compatibility with IF commands that were written before we even had $ {test} variable expansion in the CMake language. Years ago at this point...) channel 7 action news mark silva storyWebIt's important to know how CMake distinguishes between lists and plain strings. When you write: set (VAR "a b c") you create a string with the value "a b c". But when you write this line without quotes: set (VAR a b c) You create a list of three items instead: "a", "b" and "c". Non-list variables are actually lists too (of a single element). harley lemon fanfiction

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Cmake check if list is empty

[CMake] Checking for empty string - narkive

WebIf no variable name is given, removes exactly one element. Otherwise, with N variable names provided, assign the first N elements' values to the given variables and then … WebOct 25, 2024 · When part of a project’s CMakeLists.txt file, the above would print the following: Note how using set (MyVar) unset the non-cache variable and re-exposed the …

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WebNov 25, 2011 · On 11/25/2011 02:52 PM, Daniel Dekkers wrote: > Hi, > > > > I know it should be out there somewhere in the documentation, but can’t > find it.> > How do I … WebDec 8, 2024 · Variables are not assumed to be empty. If the variable is intended to be used locally, it must be explicitly initialized to empty with set (foo "") if it is a string variable, and vcpkg_list (SET foo) if it is a list variable. set (var) should not be used.

WebIf you were to run cmake -L or cmake -LH, you would see all the cached variables and descriptions. The normal set command only sets the cached variable if it is not already set - this allows you to override cached variables with -D. Try: cmake -DMY_CACHE_VAR="command line" -P cache.cmake WebNov 30, 2024 · CMake variables do not have such a state. They either have a value or are undefined. The value can be empty (which might be what you’re looking for). -Dvariable_name= will set it to the empty string. CMake differences 3.18 might consider the variable “used” in an if (DEFINED) check. I’m not sure what would have changed that.

WebNov 25, 2011 · So you can use if(NOT MYLIST) message("Either MYLIST is empty or otherwise FALSE") endif() Michael -- Powered by www.kitware.com Visit other Kitware … WebThe macro invocation is case-insensitive. A macro defined as. macro (foo) endmacro () can be invoked through any of. foo () Foo () FOO () cmake_language (CALL foo) and so on. However, it is strongly recommended to stay with the case chosen in the macro definition. Typically macros use all-lowercase names.

WebOct 25, 2024 · Since a list is represented as a string, an empty list is an empty string: set (mylist "") craig.scott (Craig Scott) October 25, 2024, 9:38pm #3 If you want to be absolutely sure that the variable will evaluate to an empty list (or empty string), use set (mylist "").

WebAn empty list is an empty variable, and evaluates to FALSE. So you can use. Yes. If you RTFM about the IF () command you see that you can either use. the variable name … harley lego fatboyWebHowever, if you just need your build to fail if a single file is missing you can use the cmake -E command line mode to compare the file with itself. This will make sure the build always … harley lewis facebookWebJul 16, 2015 · In some cases, some of those variables will be empty lists (which evaluate to false) and the function fails (as intended). But sometimes I don't even need these … harley levittWebApr 8, 2024 · By inserting message (STATUS "ENABLE_SANITIZERS: $ {ENABLE_SANITIZERS}") into your CMakeLists.txt you can print value of variable … harley letner racingWebSep 8, 2024 · According to CMake Variable documentation you have Directory, Function, and cache scope. Using include () doesn’t create a new scope it is supposed to keep the … harley lego motorcycleWebNov 25, 2011 · So you can use > > if(NOT MYLIST) > message("Either MYLIST is empty or otherwise FALSE") > endif() > > Michael >-- > > Powered by www.kitware.com > > Visit … harley leipzig thomasWebFeb 7, 2011 · You ran into a rather annoying "it's not a bug, it's a feature" behavior of CMake. As explained in the documentation of the if command:. The if command was … harley legend suspension